Exercise stepping machine



FIG. 1 is a perspective view of an exercise stepping machine showing my new design;

FIG. 2 is a right side elevational thereof;

FIG. 3 is a left side elevational thereof;

FIG. 4 is a front elevational view view thereof;

FIG. 5 is a rear elevational view view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a exercise stepping machine, as shown and described. 